While a direct flight might sound like a nonstop flight, it's not. A direct flight makes at least one intermediate stop along the way to its final destination, but has only one flight number. For example, if you choose a direct flight between New York and Houston you'd fly on one plane the whole way to Houston.

A "direct flight" is frequently confused with a "non-stop flight," but in aviation terminology, they are distinct. A direct flight is a journey between two cities that keeps the same flight number throughout, even if the aircraft makes one or more intermediate stops at other airports. For example, a flight from New York to Sydney might be listed as a "direct flight" even if it stops in Los Angeles to refuel or pick up more passengers. During this stop, you may or may not be required to deplane, but you do not change to a different aircraft or flight number. This is a carryover from earlier eras of aviation when planes lacked the range for ultra-long-haul travel. In contrast, a "non-stop" flight travels from Point A to Point B with zero interruptions. For travelers, the distinction is important because a "direct" flight will show a longer total travel time on your itinerary than a non-stop one, despite appearing as a single entry. This terminology is a key data point for your travel database, as it helps users understand why a single flight number might involve a 20-hour journey instead of a 14-hour one.